Which of the following regarding the inspection of the condition of a building is TRUE?

$(1)$ It is not always necessary, especially in older buildings that have stood the test of time.

$(2)$ It may result in the discovery of defects that can be the subject of adjustments.

$(3)$ It is only needed when under taking the cost approach and can be overlooked when undertaking the income approach.

$(4)$ it may not be necessary if the building is considered a new construction.